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Model 3 B+ chip heights?

Posted: Mon Dec 17, 2018 10:05 pm
by Flare
I would like to know how tall the two main chips are on the Model 3 B+. (The metal-covered ones)

I ask because I would like to mount a common heatsink across them, but I need to know whether or not I'll need a shim.

Re: Model 3 B+ chip heights?

Posted: Tue Dec 18, 2018 12:49 am
by jahboater
Flare wrote:
Mon Dec 17, 2018 10:05 pm
I would like to know how tall the two main chips are on the Model 3 B+. (The metal-covered ones)

I ask because I would like to mount a common heatsink across them, but I need to know whether or not I'll need a shim.
If the second main chip you refer to is the USB/ethernet chip then this heatsink cools them both,
It bolts on using the main four mounting holes. Because it is bolted on, rather than stuck on with thermal tape, you can use any fancy TIM of choice such as arctic silver; though the supplied TIM works well and is easy to apply.
https://www.amazon.co.uk/Kintaro-Alumin ... o+heatsink
It is remarkably effective, throttling is a thing of the past.

Re: Model 3 B+ chip heights?

Posted: Tue Dec 18, 2018 10:10 am
by bensimmo
It's the WiFi/BT "chip"* that is metal covered, that and the main SoC are both about 2.70 - 2.75mm high from the board, the Ethernet chip, the black one that gets very hot it only about 0.75mm high



*it's not actually a chip but a protective module with other stuff under it, not just the chip.

Re: Model 3 B+ chip heights?

Posted: Tue Dec 18, 2018 11:36 pm
by DougieLawson
bensimmo wrote:
Tue Dec 18, 2018 10:10 am
It's the WiFi/BT "chip"* that is metal covered, that and the main SoC are both about 2.70 - 2.75mm high from the board, the Ethernet chip, the black one that gets very hot it only about 0.75mm high



*it's not actually a chip but a protective module with other stuff under it, not just the chip.
Eh?

There's a silver heatsink on this photo.
Image

Re: Model 3 B+ chip heights?

Posted: Wed Dec 19, 2018 7:31 am
by bensimmo
The WiFi metal cover is there to make it a module, I cover s all the electronics under it.

The SoC has the metal cover, that's given
That answers Flares question, I got my Vernier out and measured them.

The Ethernet has no metal cover, jahboater's thinking that it was this that was the second "chip". But Flare was not on about that.

Re: Model 3 B+ chip heights?

Posted: Wed Dec 19, 2018 10:54 am
by runboy93
"Armor case" is option for you :)

Re: Model 3 B+ chip heights?

Posted: Wed Dec 19, 2018 7:29 pm
by mooblie
I see the "Kintaro" heatsink (which was unavailable for a while) seems to be back now:

https://www.amazon.co.uk/dp/B07CTSNZYK/ ... B009A8ATOK

Does anyone know (or who has one and can tell us) WHICH of the obvious three devices on the 3B+ it makes thermal contact with? (Hopefully all three, but I'm not hopeful!)

.....
(time passes)
....

OKOK, am I going to have to order one myself to find out?

Re: Model 3 B+ chip heights?

Posted: Wed Dec 19, 2018 7:48 pm
by jahboater
mooblie wrote:
Wed Dec 19, 2018 7:29 pm
I see the "Kintaro" heatsink (which was unavailable for a while) seems to be back now:

Does anyone know (or who has one and can tell us) WHICH of the obvious three devices on the 3B+ it makes thermal contact with? (Hopefully all three, but I'm not hopeful!)
I have the Kintaro heat sink on two Pi3B+ . Very good it is too.

It has two pads, one for the SoC obviously and the other for the USB/ethernet chip (which can get hotter than the SoC).

Did you mean the PMIC chip as the third obvious device?

Re: Model 3 B+ chip heights?

Posted: Thu Dec 20, 2018 3:45 pm
by mooblie
jahboater wrote:
Wed Dec 19, 2018 7:48 pm
Did you mean the PMIC chip as the third obvious device?
I was referring to the BT/WiFi module metal cover (with the embossed raspberry on it) - but from memory - that doesn't get particularly hot does it?

Is the PMIC (Power Management?) the next hottest guy there? and I assume you're saying that one is NOT cooled by the Kintaro heatsink.

Hopefully this picture is correctly labelled for reference?:
Image

Re: Model 3 B+ chip heights?

Posted: Thu Dec 20, 2018 4:38 pm
by jahboater
mooblie wrote:
Thu Dec 20, 2018 3:45 pm
jahboater wrote:
Wed Dec 19, 2018 7:48 pm
Did you mean the PMIC chip as the third obvious device?
I was referring to the BT/WiFi module metal cover (with the embossed raspberry on it) - but from memory - that doesn't get particularly hot does it?
It is an RF shield, not a heat sink.
mooblie wrote:
Thu Dec 20, 2018 3:45 pm
Is the PMIC (Power Management?) the next hottest guy there? and I assume you're saying that one is NOT cooled by the Kintaro heatsink.
Correct, it is not. I don't know if it gets hot or not. I don't recall it showing up on thermal images.
mooblie wrote:
Thu Dec 20, 2018 3:45 pm
Hopefully this picture is correctly labelled for reference?:
Looks good to me.

Re: Model 3 B+ chip heights?

Posted: Thu Dec 20, 2018 5:43 pm
by bensimmo
Image
From the MagPi Magazine.
While I think this is before the soft_throttle alteration. the Ethernet is as hot as the PMIC, which is about the same as the surroundings.

BUT I don't know the lad.
It would be nice to get a more recent one under rest, under Desktop load, perhaps a few gif's (the Google AIY Porgs gif, kills off my old laptops and Pi's! )
And then one of the cpu neon VC4 benchmarks while streaming over ethernet, while file transfer from a USB drive to SD card and maxing out the 5GHz WiFi too (a loop back from Wifi to Ethernet..)